Electromagnetic ore-separator.



tented Nov. '28, I899.

SEPARATO ELECTBOMA KREUSE GNETIC ORE pheation filed May 1 (No Model.)

theirs PATENT tron.

EMIL KREUSER, OF MECHERNICH, GERMANY.

SPEQIFICATION forming part of Letters Patent No. 638,128, dated November 28, 1899.

Original application filed February 28, 1899; Serial No. 707,212. Divided and this application filed May 12, 1899. Serial No. 716,607. (No model.)

T (0% whom it may concern.-

Be it known that I, EMIL KREUSER, retired director of Royal Mines, a citizen of Germany,

' residing at Mechernich, Rhine Province, Ger- I the space between such poles serving as the operative magnetic field through which the pulverized ore is made to pass. In such electromagnetic ore-separators it would often be advantageous for the separating process that the magnetic attraction should only be exercised by the poles of one of the cylinders. According to the present invention this is effected by covering the poles of the electromagnet which is not desired toattract the ore with a non'magnetizable material that revolves with the magnet, so that While such covering prevents the ore from adhering to the electromagnet by attraction the magnetic lines of force still flow uninterruptedly from the poles of the one electromagnet to those of the other, so as to insure the necessary strong magnetic field for acting upon the ore. It is necessary that the thickness of the said covering should be at least one-half the space between the two rolls in order to have the desired effect. Such a covering of non-magnetizable material possesses the advantages that the ore to be treated can be delivered directly onto it without the use of conveyingbelts such as have heretofore been used and which are subject to more or less rapid wear; also, that the ore can be led directly in close proximity to the magnetic poles at points where the intensity of attraction is greatest; also, that the air resistance can be reduced to a minimum and is not increased in proportion to the thickness of the conveying-belts,

as with existing arrangements, so that poW- erfully-concentrated magnetic fields can be produced, resulting in a correspondinglygreat economyin the expenditure of electrical energy.

On the accompanying drawings is shown, by way of example, one arrangement of my abovedescribed invention.

Figure 1 shows a cross-section of a pair of cylindrical electromagnets in which the one magnet has its cylindrical poles covered with non-magnetizable material. Fig. 2 shows a partial longitudinal section of the magnet with non-magnetizahle covering; and Fig. 3 is a longitudinal sectional view of one of the electromagnets, showing'suitable means by which it may be magnetized.

A and A are two oppositely-revolving cylindrical polarsurfaces of the electromagnets, the polar surface A being provided with a closely-fitting covering of non-magnetizable material a. The ore is delivered directly onto the covered magnet A, as shown, so that it serves as a conveying-roller. It does not cooperate in the actual separation of the ore, but only serves for strengthening the magnetic field by the induction of lines of force'. Owing to the thickness of the covering a the ore' is brought to a corresponding extent nearer to the polar surface of the operative magnet A, whereby the useful effect is increased and the magnetic field is utilized to greater advantage. This covering of the pole is applicable to all types of ore-separators in which only two circular poles rotate in opposite directions. It is particularlysuitable for twobar roller-magnets rotating in opposite directions, and is also of advantage in other constructionsfor instance, those of United States Patent, No. 264,620, dated September 19, 1882. The mode of exciting the rotating magnet-poles is immaterial for the purpose of this invention. The coils may be mounted on fixed magnet'cores and the pole-pieces alone revolve, or the coils may be wound on the cores and may rotate with them, as shown in Fig. 3, where A is a magnet-core, with its covering a, and B the coils connected with a contact-wheel r.

Having thus described the nature of this invention and the best means I know of carrying the same into practical eifect, I claim- :00

2 ess,12s

[0 of force, and also serve to convey the oreto and from the magnetic field, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing Wit- DGSSGS.

ElVIIL KREUSER.

W'itnesses:

CHAS. E. BARNES, WILLIAM H. MADDEN. 

